diff --git a/libs/libpocoext/utils/make-charset.cpp b/libs/libpocoext/utils/make-charset.cpp
index e40dcb3057a..321032437cf 100644
--- a/libs/libpocoext/utils/make-charset.cpp
+++ b/libs/libpocoext/utils/make-charset.cpp
@@ -11,6 +11,7 @@
 #include <iostream>
 #include <iomanip>
 #include <fstream>
+#include <cstring>
 #include <string>
 #include <list>